This release, being three and a half years after the 0.12 branch (f84d9c),
has quite a number of changes included. The following is a sampling of
the most significant ones.
Since the 0.12 release, 250 issues and pull requests have been closed.
See issues_closed_for_0.13.md for a complete list.
Deprecated and removed features:
--------------------------------
* All internal use of bits.h has been eliminated. The file will be removed.
Do not use: hexdigit(), error_ptr(), error_descrition() and it_error()
* lh_abort() is deprecated. It will be removed.
Behavior changes:
-----------------
* Tighten the number parsing algorithm to raise errors instead of truncating
the results. For example 12.3.4 or 2015-01-15, which now return null.
See commit 99d8fc
* Use size_t for array length and size. Platforms where sizeof(size_t) != sizeof(int) may not be backwards compatible
See commits 45c56b, 92e9a5 and others.
* Check for failue when allocating memory, returning NULL and errno=ENOMEM.
See commit 2149a04.
* Change json_object_object_add() return type from void to int, and will return -1 on failures, instead of exiting. (Note: this is not an ABI change)
New features:
-------------
* We're aiming to follow RFC 7159 now.
* Add a couple of additional option to json_object_to_json_string_ext:
JSON_C_TO_STRING_PRETTY_TAB
JSON_C_TO_STRING_NOSLASHESCAPE
* Add a json_object_object_add_ex() function to allow for performance
improvements when certain constraints are known to be true.
* Make serialization format of doubles configurable, in two different ways:
Call json_object_set_serializer with json_object_double_to_json_string and a custom
format on each double object, or
Call json_c_set_serialization_double_format() to set a global or thread-wide format.
* Add utility function for comparing json_objects - json_object_equal()
* Add a way to copy entire object trees: json_object_deep_copy()
* Add json_object_set_<type> function to modify the value of existing json_object's
without the need to recreate them. Also add a json_object_int_inc function to
adjust an int's value.
* Add support for JSON pointer, RFC 6901. See json_pointer.h
* Add a json_util_get_last_err() function to retrieve the string describing the
cause of errors, instead of printing to stderr.
* Add perllike hash function for strings, and json_global_set_string_hash() 8f8d03d
* Add a json_c_visit() function to provide a way to iterate over a tree of json-c objects.
Notable bug fixes and other improvements:
-----------------------------------------
* Make reference increment and decrement atomic to allow passing json objects between threads.
* Fix json_object_object_foreach to avoid uninitialized variable warnings.
* Improve performance by removing unneeded data items from hashtable code and reducing duplicate hash computation.
* Improve performance by storing small strings inside json_object
* Improve performance of json_object_to_json_string by removing variadic printf. commit 9ff0f49
* Issue #371: fix parsing of "-Infinity", and avoid needlessly copying the input when doing so.
* Fix stack buffer overflow in json_object_double_to_json_string_format() - commit 2c2deb87
* Fix various potential null ptr deref and int32 overflows
* Issue #332: fix a long-standing bug in array_list_put_idx() where it would attempt to free previously free'd entries due to not checking the current array length.
* Issue #195: use uselocale() instead of setlocale() in json_tokener to behave better in threaded environments.
* Issue #275: fix out of bounds read when handling unicode surrogate pairs.
* Ensure doubles that happen to be a whole number are emitted with ".0" - commit ca7a19
* PR#331: for Visual Studio, use a snprintf/vsnprintf wrapper that ensures the string is terminated.
* Fix double to int cast overflow in json_object_get_int64.
* Clamp double to int32 when narrowing in json_object_get_int.
* Use strtoll() to parse ints - instead of sscanf
* Miscellaneous smaller changes, including removing unused variables, fixing warning
about uninitialized variables adding const qualifiers, reformatting code, etc...
Build changes:
--------------
* Add Appveyor and Travis build support
* Switch to using CMake when building on Windows with Visual Studio.
A dynamic .dll is generated instead of a .lib
config.h is now generated, config.h.win32 should no longer be manually copied
* Add support for MacOS through CMake too.
* Enable silent build by default
* Link against libm when needed
* Add support for building with AddressSanitizer
* Add support for building with Clang
* Add a --enable-threading configure option, and only use the (slower) __sync_add_and_fetch()/__sync_sub_and_fetch() function when it is specified.
